Q. No.Mendel was able to propose laws of genetics mainly because:
1.
He knew about the correct sequence of DNA.
2.
Mendel carefully established true breeding lines and used them in hybridization experiments carried out over multiple generations.
3.
Mendel's use of peas as a model organism and his experience with plant breeding in his father's orchard.
4.
He had analyzed the results of experiments of a large number of scientists before him.
DNA mainly
1. stores information for protein synthesis.
2. mutates and leads to evolution
3. directs protein synthesis.
4. provides energy for the cell.
Black coat colour is a dominant trait while the albino trait is recessive in mice. You want to raise only black-coat mice as they appear more graceful to you. You crossed black mice with albino mice thinking that all progeny will be black based on dominance. You felt disappointed when your cross yielded only three black-coat mice out of seven. This is because you incorrectly:
| 1. | assumed that black alleles were more common than white. |
| 2. | assumed that white alleles were more common than black. |
| 3. | assumed that my black mouse was true-breeding. |
| 4. | assumed that my white mouse was true-breeding. |
Consider crossing over does not take place between chromosomes shown as:
(i) Chromosome 1: ABC/abc
(ii) Chromosome 2:Qr, qr.
Which of the following gametes will not be formed by this organism?
| 1. | ABCqr | 2. | abcqr |
| 3. | ABcqr | 4. | abcQr |
What would be the correct definition of a ‘locus’ in genetics ?
| 1. | One version of a gene. |
| 2. | The location of a gene along the chromosome. |
| 3. | The character of the gene effects. |
| 4. | The mechanism of action of a gene. |
The choice of garden peas was largely responsible for success of Mendel. All the following characteristics made the plant useful for study of genetics except:
1. They are diploid and produce haploid gametes.
2. They have a complex phenotype with much genetic variability.
3. They are relatively small and easy to grow.
4. They produce edible fruit.
Half of the mice (all males) have yellow body colour while the females are wild type(gray) in a cross between true-breeding wild type male flies and true-breeding female flies with yellow body colour. This, most likely, is due to the fact that:
| 1. | Some of your females had already mated with yellow males before you collected them. |
| 2. | Some of your parental flies must have had a new mutation in their germ cells. |
| 3. | The mutation which causes yellow body color is on the X chromosome. |
| 4. | The mutation which causes yellow body color is on the Y chromosome. |
PisumSativum is self-pollinated in crops. Why this can be a problem when used for experiments like those conducted by Mendel?
| 1. | Self-pollinated plants tend to be weaker and require more care. |
| 2. | Self-pollinated plants are not able to produce viable seeds due to inbreeding. |
| 3. | Stamens must be removed from self-pollinated plants to control fertilization. |
| 4. | Pistils of self-pollinated plants are unable to accept pollen from other plants. |
What would be true for study of karyotype of an organism, for example, humans?
1. Microscopic analysis could allow identification of unusual cellular structures.
2. An individual could be matched to a forensic sample based on identical karyotypes.
3. A specific gene which causes a genetic disorder could be identified.
4. Genetic disorders caused by chromosomal rearrangements could be diagnosed.
Identify the incorrect statement regarding a sex limited trait:
1. This term refers to a trait controlled by a gene located on the X or Y chromosomes.
2. This is a trait that occurs more frequently in one sex than another.
3. This is an extreme example of a sex influenced trait.
4. This trait is likely to be a secondary sex characteristic.
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